Test plug



FIG. 1 is an isometric front and right side view of a test plug of the present invention;

FIG. 2 is top view of the FIG. 1 test plug;

FIG. 3 is a front view of the FIG. 1 test plug;

FIG. 4 is a right side view of the FIG. 1 test plug;

FIG. 5 is a left view of the FIG. 1 test plug;

FIG. 6 is a rear view of the FIG. 1 test plug; and,

FIG. 7 is a bottom view of the FIG. 1 test plug.

I disclaim all portions in dashed lines. 

I claim the ornamental design for a test plug, as shown and described. 